Viel, E J Brachial plexus block with opioids for postoperative pain relief: comparison between buprenorphine and morphine. [electronic resource] - Regional anesthesia - 274-8 p. digital Publication Type: Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial ISSN: 0146-521X Subjects--Topical Terms: AdultAgedAged, 80 and overBrachial PlexusBuprenorphineDouble-Blind MethodFemaleHumansMaleMiddle AgedMorphineNerve BlockPain, Postoperative--drug therapy